Set arbitrary mipmap detection threshold default to 14

Now the detection heuristic has changed, the old value is no longer
valid.

Some example thresholds for known mipmap effects that should trigger:

SMG's lava has a mimimum difference of ~17.8, SMG2's clouds have a
minimum difference of ~14.8, and Wind Waker's foam has a minimum
difference of ~15

Non-triggering examples were tested and all had a calculated difference
lower than 3.

So a value of 14 should lean towards false-negatives instead of
positives, but this is clearly incomplete testing and may require
further tweaks later.

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